gap: start/stop connect with whitelist based on le_connecting_request/state

gap: interleave stop/update/start phases for adv/scan/connecting, disable scan and/or adv if whitelist is used

gap: streamline adv/scan/connection management

gap: drop adv enable/disable todos, simplify adv management

gap: improve name and use bool for whitelist_modification_pending

gap: enable whitelist management for Central and Peripheral roles

gap: new gap_set_scan_params allows to specify scanning filter policy

gap: return command disallowed for new outgoing le connection if already active

hci: track le connection request in addition to le connection state

hci: extract hci_is_le_connection_type

gap: treat AES-CCM encrypted connections as mutually authenticated, fixes #309

hci: gap_request_role is classic-only

hci: fix missing return in gap_request_role

gap: request role change for classic connection via `gap_request_role`

hci,l2cap_signaling: fix warning for LE-only

hci: outgoing classic connections result in master role

gap: provide gap_get_role to query master/slave role for HCI connection handle

hci: fix compile warnings

MISRAC2012-Rule-10.4_a: append 'u' to constant literals when used in unsigned expressions or comparisons

gap: add gap_pin_code_response_binary, fixes issue #307 / pull request #238

gap: set minium required encryption key size for Classic connections to 7, matching the Core spec

hfp_hf, hci: fix compile error

fix warnings

hci: fix compile for LE only

hci: use hci opcode in hci_send_cmd_packet